package com.mt.roll.core.utils;


import org.apache.commons.lang3.StringUtils;
import org.krysalis.barcode4j.impl.code39.Code39Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;

import java.awt.image.BufferedImage;
import java.io.*;

/**
 * 条形码生成工具类
 */
public class BarcodeUtil {

    /**
     * 生成文件
     *
     * @param msg  条形码
     * @param path 生成文件位置
     * @return
     */
    public static File generateFile(String msg, String uploadPath, String path) {
        File file = new File(uploadPath);
        if (!file.exists()) {
            // 目录不存在则创建
            file.mkdirs();
        }

        try {
            generate(msg, new FileOutputStream(new File(path)));
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        }
        return file;
    }

    /**
     * 生成字节
     *
     * @param msg 条形码
     * @return
     */
    public static byte[] generate(String msg) {
        ByteArrayOutputStream ous = new ByteArrayOutputStream();
        generate(msg, ous);
        return ous.toByteArray();
    }

    /**
     * 生成到流
     *
     * @param msg 条形码
     * @param ous 生成的流
     */
    public static void generate(String msg, OutputStream ous) {
        if (StringUtils.isEmpty(msg) || ous == null) {
            return;
        }
        Code39Bean bean = new Code39Bean();
        // 精细度
        final int dpi = 150;
        // module宽度
        final double moduleWidth = UnitConv.in2mm(1.0f / dpi);
        // 配置对象
        bean.setModuleWidth(moduleWidth);
        bean.setWideFactor(3);
        bean.doQuietZone(false);

        String format = "image/png";
        try {

            // 输出到流
            BitmapCanvasProvider canvas = new BitmapCanvasProvider(ous, format, dpi,
                    BufferedImage.TYPE_BYTE_BINARY, false, 0);
            // 生成条形码
            bean.generateBarcode(canvas, msg);

            // 结束绘制
            canvas.finish();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

